Demonstrations of Efficient Online Spectrum Defragmentation in Software-Defined Elastic Optical Networks

Elastic optical networks (EONs) facilitate agile spectrum management in the optical layer. When coupling with software-defined networking, they function as software-defined EONs (SD-EONs) and provide service providers more freedom to customize their infrastructure dynamically. In this paper, we investigate how to overcome spectrum fragmentation in SD-EONs with OpenFlow-controlled online spectrum defragmentation (DF), and conduct system implementations to facilitate highly-efficient online DF. We first consider sequential DF, i.e., the scenario that involves a sequence of lightpath reconfigurations to progressively consolidate the spectrum utilization. We modify our previous DF algorithm to make sure that the reconfigurations can be performed in batches and the “make-before-break” scheme can be applied to all of them. The modified algorithm is implemented in an OpenFlow (OF) controller, and we design OF extensions to facilitate synchronous batch reconfiguration. Then, we further simplify the DF operations by designing and implementing parallel DF that can accomplish all the DF-related lightpath reconfigurations simultaneously. All these DF implementations are experimentally demonstrated in an SD-EON control plane testbed that consists of 14 stand-alone OF agents and one OF controller, which are all implemented based on high-performance Linux servers. The experimental results indicate that our OF-controlled online DF implementations perform well and can improve network performance in an efficient way.

[1]  S. J. B. Yoo,et al.  Demonstration of online spectrum defragmentation enabled by OpenFlow in software-defined elastic optical networks , 2014, OFC 2014.

[2]  Yawei Yin,et al.  Dynamic on-demand defragmentation in flexible bandwidth elastic optical networks. , 2012, Optics express.

[3]  Meral Shirazipour,et al.  OpenFlow and Multi-layer Extensions: Overview and Next Steps , 2012, 2012 European Workshop on Software Defined Networking.

[4]  Nick McKeown,et al.  Experimental demonstration of OpenFlow control of packet and circuit switches , 2010, 2010 Conference on Optical Fiber Communication (OFC/NFOEC), collocated National Fiber Optic Engineers Conference.

[5]  S. J. B. Yoo,et al.  Fragmentation-aware routing, modulation and spectrum assignment algorithms in elastic optical networks , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[6]  Masahiko Jinno,et al.  Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies , 2009, IEEE Communications Magazine.

[7]  S. J. B. Yoo,et al.  Spectral and spatial 2D fragmentation-aware routing and spectrum assignment algorithms in elastic optical networks [invited] , 2013, IEEE/OSA Journal of Optical Communications and Networking.

[8]  Masahiko Jinno,et al.  Elastic optical networking: a new dawn for the optical layer? , 2012, IEEE Communications Magazine.

[9]  Konstantinos Christodoulopoulos,et al.  Elastic Bandwidth Allocation in Flexible OFDM-Based Optical Networks , 2010, Journal of Lightwave Technology.

[10]  Biswanath Mukherjee,et al.  Provisioning in Elastic Optical Networks with Non-Disruptive Defragmentation , 2013, Journal of Lightwave Technology.

[11]  Greg Goth.  Software-Defined Networking Could Shake Up More than Packets , 2011, IEEE Internet Comput..

[12]  Yi Pan,et al.  A study of the routing and spectrum allocation in spectrum-sliced Elastic Optical Path networks , 2011, 2011 Proceedings IEEE INFOCOM.

[13]  S. Shakya,et al.  Spectral defragmentation in elastic optical path networks using independent sets , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[14]  Lei Liu,et al.  Control and management of flexi-grid optical networks with an integrated stateful path computation element and OpenFlow controller [invited] , 2013, IEEE/OSA Journal of Optical Communications and Networking.

[15]  Changsheng You,et al.  Dynamic and Adaptive Bandwidth Defragmentation in Spectrum-Sliced Elastic Optical Networks With Time-Varying Traffic , 2014, Journal of Lightwave Technology.

[16]  Roberto Proietti,et al.  Software-Defined Fragmentation-Aware Elastic Optical Networks Enabled by OpenFlow , 2013 .

[17]  Wei Lu,et al.  Bandwidth defragmentation in dynamic elastic optical networks with minimum traffic disruptions , 2013, 2013 IEEE International Conference on Communications (ICC).

[18]  Roberto Proietti,et al.  Rapid and complete hitless defragmentation method using a coherent RX LO with fast wavelength tracking in elastic optical networks. , 2012, Optics express.

[19]  Xiang Zhou,et al.  A Two-Population Based Evolutionary Approach for Optimizing Routing, Modulation and Spectrum Assignments (RMSA) in O-OFDM Networks , 2012, IEEE Communications Letters.

[20]  Yuefeng Ji,et al.  First demonstration of enhanced software defined networking (eSDN) over elastic grid (eGrid) optical networks for data center service migration , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[21]  Ashwin Gumaste,et al.  Multipath de-fragmentation: Achieving better spectral efficiency in elastic optical path networks , 2013, 2013 Proceedings IEEE INFOCOM.

[22]  R. Nejabati,et al.  Software-defined optical networks technology and infrastructure: Enabling software-defined optical network operations [invited] , 2013, IEEE/OSA Journal of Optical Communications and Networking.

[23]  Ann Von Lehmen,et al.  Analysis and implementation of a 3-Way handshake signaling protocol for highly dynamic transport networks , 2014, OFC 2014.

[24]  Ting Wang,et al.  SDN and OpenFlow for Dynamic Flex-Grid Optical Access and Aggregation Networks , 2014, Journal of Lightwave Technology.

[25]  Arun K. Somani,et al.  Connection rerouting/network reconfiguration , 2003, Fourth International Workshop on Design of Reliable Communication Networks, 2003. (DRCN 2003). Proceedings..

[26]  Reza Nejabati,et al.  Software defined optical networks technology and infrastructure: Enabling software-defined optical network operations , 2013 .

[27]  Wei Lu,et al.  Dynamic Service Provisioning in Elastic Optical Networks With Hybrid Single-/Multi-Path Routing , 2013, Journal of Lightwave Technology.

[28]  Nabil Bitar,et al.  Extending software defined network principles to include optical transport , 2013, IEEE Communications Magazine.

[29]  Changsheng You,et al.  Reduce spectrum defragmentation latency in EONs with effective parallelization of connection reconfigurations , 2014, OFC 2014.

[30]  B. Spinnler,et al.  Reach-dependent capacity in optical networks enabled by OFDM , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[31]  Reza Nejabati,et al.  Integrated OpenFlow — GMPLS control plane: An overlay model for software defined packet over optical networks , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[32]  Lei Liu,et al.  Field Trial of an OpenFlow-Based Unified Control Plane for Multilayer Multigranularity Optical Switching Networks , 2013, Journal of Lightwave Technology.

[33]  L. Poti,et al.  Push-Pull Defragmentation Without Traffic Disruption in Flexible Grid Optical Networks , 2013, Journal of Lightwave Technology.

[34]  P. Castoldi,et al.  Fast restoration in SDN-based flexible optical networks , 2014, OFC 2014.

[35]  Lena Wosinska,et al.  Traffic re-optimization strategies for dynamically provisioned WDM networks , 2011, 15th International Conference on Optical Network Design and Modeling - ONDM 2011.

[36]  Lei Liu,et al.  Experimental validation and performance evaluation of OpenFlow-based wavelength path control in transparent optical networks. , 2011, Optics express.

[37]  Masahiko Jinno,et al.  Disruption minimized spectrum defragmentation in elastic optical path networks that adopt distance adaptive modulation , 2011, 2011 37th European Conference and Exhibition on Optical Communication.